Physics
The splitting of different colours of light in a prism is :

Disperson of light
Diffraction of light
Refraction of light
Reflection of light

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

None of these
The material of which pipes are made contracts due to cold and so breaks
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break

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